XP has long held the most market share out of any operating system. That was the case until it was overtaken in August by Windows 7 and a small margin. However, that once tiny margin has continued to grow and Windows 7 is now nearly 3 percent higher than XP in terms of market share and it shows no signs of stopping.

For the month of September, Windows 7 saw 44 percent of all web traffic, as recorded by Net Applications. XP was a close second, taking 41.2 percent. XP was a great operating system when it came out and businesses, who are slow to change, flocked to the operating system. Now, 10 years later, those businesses have reached their refresh cycle and are starting to upgrade to Windows 7-based devices.

Microsoft is helping to push the transition along, making Internet Explorer 9 and 10 not supported on the older operating system. The long-term support will also cease in April 2014, so users will no longer receive patches and bug fixes. Microsoft is also pushing the end of Vista, but not as hard as it only has 6 percent of the market.